They are slightly less precise than RTDs. With this project, you can find out!Knowing the temperature in a project can a very useful piece of data to have handy. For example, the thermistor may be used as a flow-rate sensor, since the dissipation constant increases with the rate of flow of a fluid past the thermistor. De vergelijking van Arrhenius geeft het verband tussen weerstand en temperatuur: = ⋅ Hierin is: R: de weerstand in Ω A: een constante in Ω e: de wiskundige constante e
(For more information and to learn to calculate Beta, visit our page NTC Thermistor Beta or check our our blog on The Secret to Successful Thermistor Beta Calculations.). I encourage you to try to manipulate the equation from the article yourself to get better at algebra. They are used to measure temperature, control temperature and for temperature compensation. If superior accuracy is required, the temperature range must be reduced and accuracy of better than ±0.01°C over the range of 0°C to +100°C is achievable.The choice of the formula used to derive the temperature from the resistance measurement needs to be based on available computing power, as well as actual tolerance requirements. This sensor is called a thermistor.A thermistor exhibits resistance that is far more sensitive to temperature than that of other types of resistors.We will use an Arduino to measure and process the reading from a thermistor and then convert this into a human-friendly format of common temperature units.Below is a picture of the thermistor we are going to use:In a typical application of a resistor, you do not want the resistance to change with temperature. So let us solve for that using algebra magic:\[R_{thermistor}=R_{balance}\cdot(\frac{V_s}{V_{out}}-1)\]This is almost perfect but we need to measure our voltage output now as well as the supply voltage. Figure 1. This makes the PTC thermistor a little harder to interface with. If you're working with a microcontroller that has only one ADC module, you can't measure two thermistors at the exact same time. This is by no means a list of every technique out there, but it will show you some popular approaches.Some manufacturers are nice enough to give you an entire chart mapping a certain integer range of temperature and resistance (typical values). We can do this using a voltage divider:This will be our interface circuit to our thermistor. NTC stands for Negative Temperature Coefficient. There are many different semiconducting thermistors with a range from about 0.01 Most PTC thermistors are made from doped polycrystalline Barium titanate thermistors can be used as self-controlled heaters; for a given voltage, the ceramic will heat to a certain temperature, but the power used will depend on the heat loss from the ceramic. Conversely, when temperature decreases, resistance increases. They are suitable for temperature measurement, control and compensation for use over a range of -112°F to 302°F (–80°C to 150°C) with interchangeability down to ±0.18°F (±0.1°C).
Even so, RTDs remain the most accurate sensors with their accuracy being ±0.5% of the measured temperature, and they are useful in the temperature range between -200°C and 800°C, a much wider range than that of NTC temperature sensors.Compared to RTDs, the NTCs have a smaller size, faster response, greater resistance to shock and vibration at a lower cost. Since there are three unknowns, you need three measurements of resistance at a certain temperature which then can be used to create three equations to solve for these constants.Even for those of us that are algebraic wizards, this is still too much work.Instead, there is a simpler equation that is less accurate but has only one constant.
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